Issue #11823: disassembly now shows argument counts on calls with keyword args

Lib/dis.py

@@ -190,6 +190,9 @@ def disassemble(co, lasti=-1):
                 if free is None:
                     free = co.co_cellvars + co.co_freevars
                 print('(' + free[oparg] + ')', end=' ')
+            elif op in hasnargs:
+                print('(%d positional, %d keyword pair)'
+                      % (code[i-2], code[i-1]), end=' ')
         print()
 
 def _disassemble_bytes(code, lasti=-1, varnames=None, names=None,
@@ -229,6 +232,9 @@ def _disassemble_bytes(code, lasti=-1, varnames=None, names=None,
                     print('(%d)' % oparg, end=' ')
             elif op in hascompare:
                 print('(' + cmp_op[oparg] + ')', end=' ')
+            elif op in hasnargs:
+                print('(%d positional, %d keyword pair)'
+                      % (code[i-2], code[i-1]), end=' ')
         print()
 
 def _disassemble_str(source):

Lib/opcode.py

@@ -6,7 +6,7 @@ operate on bytecodes (e.g. peephole optimizers).
 
 __all__ = ["cmp_op", "hasconst", "hasname", "hasjrel", "hasjabs",
            "haslocal", "hascompare", "hasfree", "opname", "opmap",
-           "HAVE_ARGUMENT", "EXTENDED_ARG"]
+           "HAVE_ARGUMENT", "EXTENDED_ARG", "hasnargs"]
 
 cmp_op = ('<', '<=', '==', '!=', '>', '>=', 'in', 'not in', 'is',
         'is not', 'exception match', 'BAD')
@@ -18,6 +18,7 @@ hasjabs = []
 haslocal = []
 hascompare = []
 hasfree = []
+hasnargs = []
 
 opmap = {}
 opname = [''] * 256
@@ -152,6 +153,7 @@ haslocal.append(126)
 
 def_op('RAISE_VARARGS', 130)    # Number of raise arguments (1, 2, or 3)
 def_op('CALL_FUNCTION', 131)    # #args + (#kwargs << 8)
+hasnargs.append(131)
 def_op('MAKE_FUNCTION', 132)    # Number of args with default values
 def_op('BUILD_SLICE', 133)      # Number of items
 def_op('MAKE_CLOSURE', 134)
@@ -165,8 +167,11 @@ def_op('DELETE_DEREF', 138)
 hasfree.append(138)
 
 def_op('CALL_FUNCTION_VAR', 140)     # #args + (#kwargs << 8)
+hasnargs.append(140)
 def_op('CALL_FUNCTION_KW', 141)      # #args + (#kwargs << 8)
+hasnargs.append(141)
 def_op('CALL_FUNCTION_VAR_KW', 142)  # #args + (#kwargs << 8)
+hasnargs.append(142)
 
 jrel_op('SETUP_WITH', 143)
 

Lib/test/test_dis.py

@@ -38,7 +38,7 @@ def _f(a):
 dis_f = """\
  %-4d         0 LOAD_GLOBAL              0 (print)
               3 LOAD_FAST                0 (a)
-              6 CALL_FUNCTION            1
+              6 CALL_FUNCTION            1 (1 positional, 0 keyword pair)
               9 POP_TOP
 
  %-4d        10 LOAD_CONST               1 (1)
@@ -50,7 +50,7 @@ dis_f = """\
 dis_f_co_code = """\
           0 LOAD_GLOBAL         0 (0)
           3 LOAD_FAST           0 (0)
-          6 CALL_FUNCTION       1
+          6 CALL_FUNCTION       1 (1 positional, 0 keyword pair)
           9 POP_TOP
          10 LOAD_CONST          1 (1)
          13 RETURN_VALUE
@@ -68,7 +68,7 @@ dis_bug708901 = """\
               6 LOAD_CONST               1 (1)
 
  %-4d         9 LOAD_CONST               2 (10)
-             12 CALL_FUNCTION            2
+             12 CALL_FUNCTION            2 (2 positional, 0 keyword pair)
              15 GET_ITER
         >>   16 FOR_ITER                 6 (to 25)
              19 STORE_FAST               0 (res)

Misc/NEWS

@@ -21,6 +21,8 @@ Core and Builtins
 Library
 -------
 
+- Issue #11823: disassembly now shows argument counts on calls with keyword args.
+
 - Issue #14711: os.stat_float_times() has been deprecated.
 
 - LZMAFile now accepts the modes "rb"/"wb"/"ab" as synonyms of "r"/"w"/"a".